BLE03 is an MLAB Bluetooth and Wifi connectivity module built around the TI CC3301. It provides 2.4 GHz Wi-Fi 6 (802.11ax) and Bluetooth Low Energy 5.4 as a companion IC intended to be controlled by an external MCU/MPU host over SDIO (4-bit) (or SPI on the chip), plus UART HCI for BLE.
- Wi-Fi
- 2.4 GHz Wi-Fi 6 (802.11ax), 20 MHz, 1×1 SISO
- Backward compatibility: 802.11 a/b/g/n/ac
- HW crypto: WPA2 / WPA3
- Up to +20.5 dBm TX power (integrated PA)
- Application throughput up to 50 Mbps
- Bluetooth
- Bluetooth Low Energy 5.4 (CC3301)
- HCI transport via UART (or shared SDIO on the chip)
- Module implementation highlights
- Onboard 1.8 V regulator (MIC5504-1.8) fed from 3.3 V input
- Bidirectional level shifting to 3.3 V logic using TXS0104 / TXS0108 for host interfaces
- 2.4 GHz RF routed through a front-end with an SAW filter to an MCX coax antenna connector
The design follows CC3301 reference integration principles: external 40 MHz fast clock (XTAL), external 32.768 kHz slow clock, SDIO host interface, and RF port brought out to an external antenna connector.
- Input:
3.3Vto module power header J2 - Onboard regulation: MIC5504-1.8 generates
+1V8for CC3301 domains and level shifters - CC3301 rails (chip-level reference):
- VMAIN / VDDA / VIO / VPP: 1.8 V nominal
- VPA: 3.3 V nominal (PA supply)
Power-up sequencing note (chip requirement): all supplies must be stable before releasing nRESET high; keep nRESET low at least 10 µs after supplies stabilize.
CC3301 supports 4-bit SDIO (up to 52 MHz high speed) or SPI at the chip level. BLE03 breaks out the SDIO signals through a level shifter to the host connector.
BLE HCI UART is routed through a level shifter to the host connector:
UART_TX,UART_RX,UART_CTS,UART_RTS
BLE03 is a controller IC: the host is responsible for overall application logic. Typical integration:
- Wi-Fi: host communicates over SDIO and runs the networking stack (Linux/RTOS use-cases are explicitly targeted by CC330x).
- BLE: host uses UART HCI to a BLE stack/controller interface.